Top U.S. scientists and public officials — including Boston’s health chief and Harvard University researchers — are taking the war on soda to the Obama administration, calling for “safe level” rulings on sugar content, warning labels and smaller servings.

“If we do have soda, it should be used in the amount we had back in the 1950s,” said Dr. Walter Willett of the Harvard School of Public Health, who advocates a ban on soft drinks larger than 6.5 ounces.

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